Can I use someone else's vibrator?

Short Answer:
If you use someone else's sex toys, always make sure to clean and disinfect
them first or cover them with a condom to avoid transmitting germs or STDs.

Long Answer: The thought of
borrowing your roommate's vibrator while she's out seems kind of gross
to us, but maybe it's a turn on for some people. In any case, if you're
using another person's vibrator because you don't have one of your own,
or if you are sharing one during sex play with a partner, you need to be
aware that you can catch something off of it. Probably the worst thing
you'd catch would be a yeast or bacterial infection, but who wants that?
You could also catch chlamydia, gonorrhea, or trichomoniasis.

To be safe, wash the toy
thoroughly with soap and hot water. Remove the batteries first, and if
it's not a waterproof vibrator make sure not to submerge it or get water
inside the battery compartment. If it's an electric vibrator, make sure
it's not plugged in before you wash it. You can disinfect the surface
with hydrogen peroxide (bleach or alcohol may damage the toy material).
Whenever sharing a toy, it's also a good idea to cover it with a condom,
which makes it easier to clean between uses/users. If you and a friend
are playing with a vibrator together, don't get your fluids mingled.
Clean it or change the condom when the vibrator passes between
users/orifices.